Type wheel positioning mechanism for printing telegraph apparatus



R. D. SALMON TYPEWHEEL POSITIONING MECHANISM FOR Feb. 22, 1949.

I PRINTING TELEGRAPH APPARATUS Fzled Jan 11 1945 4 Sheets-Sheet 1 F /GJ.

'- Inuentor Rumam Denim Q'Rmon Attornzf 1949. R; D. SAL.MON

- TYPEWHEEL POSITIONING MECHANISM FOR PRINTING TELEGRAPH APPARATUS 4 Sheets-Sheet 2 Filed Jan. 11, 1945 Reg-mm; DENNW: Sauna By I 'Attor ey Feb. 22, 1949. R. D. SALMON TYPEWHEEL POSITIONING MECHANISM .FOR PRINTING TELEGRAPH APPARATUS Filed Jan. 11, 1945 4 Sheets-Sheet 3 Inventor 99mins EIRLMDN' Feb. 22, 1949. R. D. SALMON 2,462,132 TYPEWHEEL POSITIONING MECHANISM FOR PRINTING TELEGRAPH APPARATUS Filed Jan. 11, 1945 4 Sheets-Sheet 4 In venlor FEQ-(MRQDEINNFJSHLNQN By A Attor zey Patented Feb. 22, 1949 TYPE WHEEL POSITIONING MECHANISM FOR PRINTING TELEGRAPH APPARATUS Reginald Dennis Salmon, Croydon, England, assignor to Creed and Company Limited, Croydon, England, a British company Application January 11, 1945, Serial No. 572,344

In Great Britain January 15, 1944 15 Claims.

This invention relates to printing telegraph receivers in which a type wheel is providedwith a plurality of rows of typenormally out of print-=- ing-position and meanseffectivefor everyoperation of printing from any of said rows for bringing the selected row into and out of printing position.

Such a printing telegraph receiver is described and claimed in British Patent No. 524,342. Primarily that patent claims a printing telegraph receiver comprising a typewheel normally located in such position that the line on the paper upon which printing is to take place is visible and the type wheel is moved into printing position to'print on said line and again out of such position for each printing operation. As in the machine described in that patent the type Wheel is furnished with two rows of type some means is necessary to bring the selected row of type into and out of printing position. This is effected in the machine described by giving to a lever for raising the typewheel an amount of movement a little more than is necessary to move the lower row of type into printing position. The

type wheel shaft is then arrested in its movement by one of two abutments selected according to whether the upper or lower row of type is to be selected for printing- By such an arrangement the type wheel shaft is subjected to shocks at each movement.

It is the principal object of the present invention to provide'a tprinting'telegraph receiver of the kind specified above in which shock to any of the parts concerned in the-movement of the typewheel is substantially eliminated.

According to one feature of the present invention a printing telegraph receiver comprises a typewheel provided with a plurality of rows of type normally out of printlng position and means efiective for every operation of printing from any of said rows for bringing the selected row into and out of printing position in a motion which approximates to simple harmonic motion, whereby shock is substantially eliminated.

According to another feature of the invention a printing telegraph receiver comprises a type Wheel having the type thereon arranged in a plurality of rows, a plurality of levers corresponding respectively to the rows of type, each having a different ratio, means for selectively rendering one of said levers effective to move said type wheel, and means for actuating the selected lever to bring the corresponding row of type into printing position andto return the typewheel into a position to leave the printed character visible.

In the apparatus described in the abovemem tioned British Patent No. 524,342 the type Wheel is mounted in a stationary framework and the platen carrying the paper is traversed for the printing of successive characters.

It is a further object of the present invention to provide a page printing telegraph receiver having a typewheel provided with a plurality vof rows of type and means for bringing a selected one of said rows into printing position and out of printing position to leave the printed character visible, in which the type wheel is mounted on a carriage which is traversable, for letter spacing parallelto a platen mounted for rotation in a fixed framework. In fulfilling this object the embodiment of the invention to be described employs the invention claimed in U. S Patent No. 2,308,306, viz: a page printing telegraph receiver comprising a typewheel having its axis substantially at right angles to the axis of the platen,'and having the type elements arranged in a plurality of rings, in which the type wheel is rotatable to select a type element within a ring of elements, movable axially to select one of said rings and traversable parallel to the axis of the platen for letter spacing and means is provided for moving a selected individual type element radially of the type wheel to effect printing.

In the embodiment of. the invention described below'the type wheel is rotated by means of a. spline shaft along which the movable carriage is traversed. This, method of rotating thetypewheelhas considerable advantages from the point of view of simplicity and also asenabling almost any desired form of translation of the received signal elements into a selective positioning .of the typewheel to be used but it unfortunately presents manufacturing difliculties which it is believed have not hitherto been overcome in practice. These difliculties arise from the f-aet that it is impossibletomanufacture aperfectly straight spline shaft. These difficulties have, however, been overcome by providing a self aligning coupling between a member keyed to the spline shaft and a member freelyrotatable about the spline shaft.

A page printing telegraph receiver embody-v ing the invention will be described in conjunction with the accompanying drawings in which:

Fig. 1 is an exploded perspective viewof the machine, the framework upon which it is mounted and some details being omitted for the 3 sake of clearness. A few parts are shown in section.

Fig. 2 is a sectional view of the driving means for the typewheel.

Fig. 3 is a detail, omitted from Fig. 1 for the sake of clearness, showing the carriage return mechanism.

Fig. 4 is an exploded view of a. self aligning coupling used in the driving means for the type wheel.

Fig. 5 shows curves for explaining the shift movement of the typewheel and its timed relation to the printing action and the selective rotation of the typewheel."

Referring to the drawings, Fig. 1 shows an exploded perspective view of a page printing telegraph receiver employing a typewheel mounted on a movable carriage. The framework upon which the parts are mounted has been omittedin order not to obscure any parts of the'niechanism; this framework and the'manner inwhich the mechanism is mounted therein are of well known construction and form no part of the present invention. H

An electric motor I drives a main shaft 2 through gearing}. The, shaft 2 drives through gearing 4 a shaft 5 "from which various cam sleeves j arej driven through clutches aswill presently appear.

The translating 'mechanism is similar to that describedin ULS. Reissue Patent No. 17,725. An electromagnet 6 responds to the incoming signals and in response to the start elementvof a signal moves its armature I tov the right in Fig. 1, thereby rotating lever am a'clockwise direction. Lever Bis mounted on a rock shaft Bjcarrying a detent lever Ill. Rotation' 'of detent lever Win a clock wise direction removes it from a detent II on a camsleeve l2 tending to be driven through a clutchinotshown) from shaft 5, and cam sleeve l2 thus commences torotate. 11A striker pin I3 is carried on a link M pivoted to "a lever l5 carrying a cam follower IG held by aspring (not'shown'i against a cam llj on cam sleeve 12. A cam" l8 also fixed on cam sleeve l2 reciprocate's a striker lever l9 moving in guides 20"fixed torock shaft 9. 'As the'rock shaft 9 is rotated anti-lockwise or clockwise by armature l in; accordance with the character of received signal elements the striker lever I9 engages striker pin l3 or is clear thereof. The striker pin I 3 during the'reception' of a signal is being traversed 'over selector fingers 2| so that at'the middle of the intervalallotted to a signal element it is immediately over oneof these fingers, of which there are five as shown in the case of a five unit code. Thus if during a signal element period the striker lever l3 engages the striker pin I3, 2. selector finger 2l is moved downwards. The selector fingers are mounted, so that they are held by friction in the position into which they are moved. The mechanism thus described is that described in U. S. Reissue Patent No. 17,725," with the sole-exceptionthat the striker pin [3 is struck against selector fingers 2| in a vertical plane instead of a horizontal plane as in the above mentioned patent.

The selector fingers 2| are pivoted on a finger actuating lever 22 and after the selector fingers lahave all been'set in accordance with the elements of the received signal, a cam (not shown) onthe cam'sleeve l2 movesthe lever 22 so as tocause the selector fingers 2i tobe moved to the right'in the-drawing to act upon a set of members for determining the position of a typewheel.

one-revolution In the mechanism described in the above mentioned patent the selector fingers when moved by their actuating lever are caused to act upon notched code discs. In order to separate the type wheel positioning mechanism from the function mechanism, the selector fingers 2| are caused to set corresponding code bars 23, which code bars act to position notched code discs and also to select the functions to be performed. Furthermore the code bars 23 remain in the positions into which they are actuated by the selector fingers 2! instead of being returned into initial position by springs as are the code discs described in the above mentioned patent.

It a selector finger 2! has been moved downwards by thestriker pin [3 it is opposite the end 2 3 of its corresponding code bar 23. If a selector finger 2| has not been moved by the striker pin 13 it is opposite the end of a corresponding member 25. Members 25 are pivotally mounted on one end of corresponding'levers 26 pivoted at 21, the other ends of which are pivotally attached to code bars 23. If a selector finger 2| is opposite the end 24 ofits corresponding code bar 23 when movedto the right, the corresponding code bar 23, if in'its leftward position, will be moved to the right. The corresponding lever 26 will be rotated anti-clockwise and will bring corresponding member 25 into position to be struck by a selector finger 2 I if the latter be in the upper position'when subsequently moved to the right. If a selector finger 2| when moved to the right is opposite amember 25 and the corresponding code bar 23 is in its rightward position, finger 2i willstrike member 25, lever 26 will be rotated clockwise and code bar 23 moved to the left. It will be seen that if a code bar is already in the position into which it is to be moved, the end 24 of the code bar or the member 25 as the case may be will be to the right and a sufficient distance to ensure that the selector finger 2| does not come into contact therewith.

The code bars 23 are held in'either of the two positions into which they are actuated, by means for example of'jockey sprin s (not shown).

Linked to each code bar 23 is a notched combination disc 28. There are thus five notched code discs 28 and these are arranged in relation to stop members 29 placed around their periphery and a stop arm 30 in the manner described in the above mentioned Reissue Patent No. 17,725. The stop members 29 are urged towards the centre of the discs 28 by means of a spring 3| and a given setting of the discs allows one of thestop members 29 to be moved into the path of the stop arm 36, which is fixed to a short shaft 32 (Fig. 2). The shaft 32 is driven from a shaft 33 through a clutch 34. The shaft 33 is driven through gears 35 from a shaft 36 which in turn is driven from shaft 2 through gears 31. The shaft 32 is connected to a hub 38 through a shock absorbing coupling 39 which is described and claimed in United StatesPatent No. 2,382,668 issued August 14, 1945..

The clutch 34 is also described in that patent.

When the code bars 23 and thus the code discs 28 are reset in a fresh combination the stop member 29 that was resting ina series ofaligned notches is forced out of those notches'arid accordingly out of the path of stop arm 30. The stop arm 30 and the hub 38 commence to rotate and continue to do so until the stop arm 33 engages another stop member 29 that has fallen into a new series of aligned notches in the discs The hub 38 is fixed to a spline shaft 43 through which it drives a typewheel 4!. The typewheel eeree rse 4lis fixed to a vertical spindle '42 "(Fig.z'2)

mounted in -bearings and Min a carriage 45.,

The carriage 45 runs on guide 'rails" 46, 4l '(Fig. 1) Spindle 42 isprovide'd -at its lowerend with'a squared portion 48 '(Fig. 2) which 'can slide within an internally squared .sleeve -49 carrying a bevel-gear 50. Aisocarried on carriage 45 is a bearing EI within which 'is-rotatably mounted a sleeve 52 coaxial with the spline shaft 40. Fixed to sleeve"52is a bevel gear 53 meshing with bevel gear- '50. "Sleeve 52 is driven through a self alignin-g coupling'from a sleeve 54 also mounted on carriage l5 and -slidea-ble along spline shaft 40 but keyed tothe spline shaft '40, The self aligning coupling is shown exploded in Fig. 4 and comprises a thin sleeve 55 freely rotatable about shaft '46 and having formed on its opposite ends twokeyways 56 and 51 at right angles to one another. A-keytii on sleeve 52 engages in key way 5l and a key 59 on sleeve 54 engages in key way56. 'Sleeve 55 is of such thickness that keys 58 and 59 engage therewith in almost the same vertical plane. If sleeve 52 is out of alignment withsleeve fi i and/or sleeve 55 the keys 58, 59 still enga'gein slots 5'l and 56 respectively and so transmit rotary motions. The interior of sleeve 54 is fil-led with lubricating material 50 to providelubrication of the sliding motion along the'spline shaft. -By means of the arrangements just described the type wheel 4| is rotatable to select a position ofthe type from which printing is to take place. The t pe elements on the typewheel are arranged in two rings and these type elements are mounted in the typewheel in'such a manner as tobe adapted to be struck radially from the typewheel to 'efiect printing, the arrangement and mounting of the elements in the typewheel being the "same-as described in said BritishPatent No. 524,342. The carriage 45 is traversable parallel to 'a platen 6!, and the typewheel is movable a-kiallyto bring one of the rings of type into printing position and to move a selected individual type element radially of the typewheel to effect printing in a manner now to be described. I, The functions just referred to are'controlled from the code bars 23 in the manner described and claimed in United States Patent No. 2,346,- 944. Lying'across the code bars 23am function selecting members There is a memberSE-for each functionincluding printing, letter space, figure shift and carriage returns. Only some of the function selecting members '62 have been shown, and these only diagrammatically,'but it is to rbe'understood that these members are constructed in the same manner as the function selecting members described in U.S.'Patent No. 2,346,944 and are arranged in relation to the code-bars 'zfiin the same manner as the function selecting members are arranged in relation to thecombination bars describedin that patent.

After code bars 23 have been positioned, a cam (not shown) -on cam sleeve l2 releases a cam sleeve 63 to be driven for one revolution by shaft 5. A cam (illv onxcam 'sleeve"63,ractuates a "cam follower "65 to move, through alink 66, a bail 61, which as described in U.S. Patent N0.2,346,944 above referred'to first allows one or more of the members 82*to be'moved to the right by a spring and :then moves tothe left to move any selected function member to thelleftto initiate thesperformance of the selected function. The function members '62 are showrrin Fig. 1

as 'acting upon 1 corresponding contact ."mem'bers '68 each I of which 'when acted upon ":by its :corresponding function member '62 causes the closure of a circuit to energize an electromagnet which thereupon'releases'a cam for rotation to perform the required function. It is tobe understood, however, that seiected function members s: when moved to the left by bail (5'! may release the corresponding cams for rotation through mechanical linkages.

The electromagnet 69 is the printing electromagnet' and when operated releases a cam sleeve 'E l'for rotation through one revolution, the cam sleeve 10 being driven by shaft 5. The typewheel M 'is normally located below the line of printing and must therefore be raised into the line of printing before printing takes place. Cam sleeve m is formed'with a grooved cam H, the groove having the form of a sine curve, and through a cam follower 12 moving in'this groove, acts upon a lever'l3 pivoted on a rod 14 fixed in the framework (not shown). The other-end of lever-"l3 acts upon an extension '15 of a frame 16 also pivoted on rod M. The frame 16 carries a bail ll. The first movement of lever 13 is counterclockwise and thus bail 11 is moved counter-- clockwise. A iever l8 pivoted on carriage A5 is formed with one end forked and engaging bail Hand is thus rotated clockwise. The other end of lever 18 engages between flanges 79 of a mem-' ber fixed to the typewheel spindle 22 and as lever 78 is rotated clockwise the typewheel spindle is raised. At the same time lever 'l3 acts upon a lever fill attached to a rockshaft 8i. Fixed to the rockshaft al are levers 82 and 83 which enga e the ends of a frame M carrying an ink ribbon 85. The ink ribbon 85 is thus raised with the typewheel 4|. As the upper row of the typewheel reaches the line of printing a cam 86 on cam sleeve lilacts on an extension "8! of a frame 88 carrying a printing bail 89. Printing ball 89 is engaged by the forked end of a printing lever 99 pivoted on carriage 45 and the printing lever 91? is rotated sharply in a counter clockwise direction to move a printing hammer 9|, pivoted thereto. The pr nting hammer is also pivoted to a lever 92 which is itself pivoted on the upper portion of the carriage 5. The printing hammer is thus guided to move a type eiement radially of the type wheel and so strike the ink ribbon 85 against a sheet of paper 93 on the platen 6 I.

Just before the printing hammer 5| strikes a 7 type element, the movement of the printing lever all allows a ccrrector lever 94 pivoted on the carriage -45 to be moved by a spring (not shown) towards the typewheel spindle 42 in such manher that a corrector member 95 on the end of lever 9d engages between teeth of a corrector wheel 96 fixed to the spindle 42 of the typewheel. As stated above the cam H, which acts on lever 13 to move bail "H to raise the typewheel into the-line of printing, is sine shaped so that 1 after printing has taken place the typewheel 4i is-again lowered to allow the last printed charac ter to be visible. At the same time also the lever '53 allows levers 82 and 83 to rotate clockwise under the influence of a spring 91 to lower the ink ribbon frame. Lever 83 is formed as a'bell crank one arm of which is engaged by a lever 98 acted on by the spring 91. As lever. .98 is reciprocated first in an anti-clockwise and then in :a clockwise direction, it reciprocates a pawl 99 of an'inkz'ribbontfeeding and reversing mechanism constructed as vdescribed in .U. 15. Patent No: 2,090,811.. 5

being held by the armature I02. When the function member 62 for figure shift is selected, winding IOI is energised and the armature I02 rotated in a clockwise direction to disengage it from lever I03.

Subsequently when lever I3 is moved by cam II; lever I03 is caused by spring I04 to press against a pin I05 constituting an extension of cam follower. I2 moved in a simple harmonic motion by cam II. Lever I03 is .pivoted at I03 so as to have a greater ratio than lever I3. Lever I03 acts on extension I5 of frame I6 and moves bail II to a greater extent than it is moved by lever I3 and the lower row of characters on the typewheel is raised into printing position. Armature I02 is fixed to a rock shaft IN on which is fixed a lever I08 linked to a bar I09. The bar I09 extends alongside code bars 23 and forms a sixth code bar for determining the selection of such function members 62 as are only 'to be selected following the figure shift combination as described in U. S. Patent No. 2,346,944.

The letter spacing function member of the members 62 closes a contact to operate an electromagnet H0, which releases a cam sleeve III to be driven through a one revolution clutch from shaft 5. A cam H2 on the cam sleeve III acts on a. cam follower H3 carried on a rack H4. The rack H4 is mounted for longitudinal movement and is reciprocated longitudinally by .cam H2. A pawl H5 carried on the carriage 45 engages rack H4 so that movement of rack H4 to the right moves the pawl H5 to the right and with it the carriage 45. A pawl IIB also carried on carriage 45 engages teeth on a fixed rack III. When the carriage 5 is moved to the right by rack H4, pawl H6 rides over a tooth on the rack III but when rack H4 is returned to the left the pawl H6 engages a tooth on the fixed rack III and prevents the carriage 45 being returned to the left.

A steel tape I I is secured at one end to a post H9 on the carriage 45 and is wound round a spring drum I20 to which the other end is secured. Accordingly the carriage 45 is moved to the right against the force of the spring in the drum I20. The mechanism for returning the carriage to the left in Fig. 1 is not shown in that figure, but is shown in Fig. 3. The carriage return function member 62 closes a contact to operate a carriage return release magnet (not shown) which releases a cam I2I- for one revo-- lution. Cam I2I acts on a bar I22 which lies between the racks H4 and H7 (Fig. l). The bar I22 is mounted on pins I23 and I24 which engage in inclined slots I25 and I26 in the bar. Accordingly as bar. I22 is moved to the right by cam I2I it is raised so that a projection I2I on the underside of the bar rides over a latch I28 pivoted at I29 held by spring I30 against the projection I21. Bar I22 is raised until a shoulder I 3| on latch I28 engages behind projection I21 and holds bar I22 in raised position. The pawls H and H6 carry pins I32 (Fig. 3) which engage the upper surface of bar l22 so that when the bar I22 is raised pawls H5 and H8 are raised out 'of engagement with the racks H4 and III respectively. The steel tape H8 is thus enabled to draw the carriage 45 to the left in Fig. 1 under the influence of the spring in thedrum I20. As the carriage 45 approaches the beginning-of-line position it strikes one end of a lever I33 (Fig. 1), the other end of which moves a plunger I in a dashpot I35 to cushion the movement of the carriage. As the carriage reaches beginning-ofline position a shoe I38 (Fig. 3) carried thereon engages the horizontal arm of lever I28 and rotates it clockwise, thus freeing shoulder I8I from the projection I2'I on bar I22 and allowing bar I22 to return to normal position.

The line-feeding function bar 62 closes a contact to operate magnet I3I which releases a cam I38 for rotation by shaft 5. The cam I38 operates a lever I39 to which is linked a spring pawl I40 which acts on a ratchet wheel Hi to rotate the platen SI for line feeding.

It will be clear from the preceding description that a signal combination received by the apparatus described results in the printing of a character whilst a succeeding signal combination is sin received. During the receipt of a signal combination the selector fingers 2| ara-being set in accordance with the kinds of the succeeding signal elements. During the receipt of the stop elements the selector fingers 2I are moved to the right to set bars 23 and as selector fingers 2I are moved back to the left they are restored to normal position ready to be reset in accordance with the succeeding signal combination. Whilst this suc-. ceeding signal combination is being'received, the rotary movement of the typewheel consequent upon the release of stop arm 30, when the combination discs 28 are moved by the code bars 23, takes place. The time allotted for rotation of the typewheel must be suflicient to allow for a complete rotation. Fig. 5 shows in curve A a graph of the motion of the typewheel and this curve A shows the motion of the typewheel through 21 radians in a fraction mT of the total time allotted to the rotary movement. As stated above, the typewheel is driven from shaft 33 through a clutch 34 and a shock absorbin coupling as described and'claimed in said U. S. Patent No. 2,382 668 and the interval of time 'It, out of the total interval T, is allowed for the energy of movement of the spline shaft 40 and the gearing connecting it with the typewheel. Curve C of Fig. 5 shows the shape of the cam II effecting the axial movement of the I typewheel and is consequently a graph of the vertical movement of the typewheel. The point I42 represents the lowest and thus the normal position of the typewheel and the startinglpoint of the vertical movement. It willbe seen that the vertical movement may commence whilst the rotary movement of the typewheel is continuing but that the rotary movement has ceased before the typewheel has reached its highest point. Curve B of Fig. 5' represents the outline of the printing cam 86 and it will be seen that printing takes place when the typewheel has been raised to its highest point. Thereafter the downward movement of the typewheel to leave the printed character visible commences and the rotary movement of the typewheel in consequence of a new positionin of the combination discs 28 may commence whilst the typewheel is being lowered to normal position.

movements of. the typewheeloccupy a period which; is equal to thefull period allowed for the. selective rotary positioning of the typewheel; and this combined with the simple harmonic motion in a, vertical direction enables this, motion to be carried out without shock. It should be noted thatshock is liable to occur at the beginning and the end of this vertical motion so that it is important that the motion at these two points; should be. as nearly as possible simple harmonic. but in the interval between need only approximate thereto. It will be clear alsov that the vertical movement of the typewheel is equally simple harmonic motion whether the typewheel is raised to enable printing to be efiected from a type element in the upper or lower row of elements thereon, due to the fact that the difierence of amplitude of motion is obtained by means of levers of. two different ratios, but actuated by the. same cam.

What is claimed is:

. 1. Page printing telegraph receiver comprising a=platen, a spline shaft parallel to the axis of said platen, a carriage movable along said splineshaft,

a typewheel mounted in said carriage withitsaxis substantially at right angles to the axis of said platen, a gear wheel mounted on said carriage so as to be freely rotatable about said spline shaft,

a sleevekeyed tosaid spline shaft and movablewith said carriage, a self aligning coupling connecting said gear wheel and said sleeve, gearing connecting said typewheel and said gearwheel, means for selectively rotating said spline shaft to select a type on said typewheel, means for printing from the selected type and means for traversing said movable carriage along said spline shaft for letter spacing.

2.. Page printing telegraph receiver as claimed.

in claim 1 comprising means for axially moving said typewheel in an approximation to asimple harmonic motion into position to print. on a line on said platen and out of position to leave the printed character visible.

3. Printing telegraph receiver comprising a typewheel. having the type thereon arranged'in a plurality of rows, means for rotating the typewheel selectively, means for selectively shifting said typewheel to bring a selected row of type into printing position including a plurality of levers of different ratios and operating connections from each of said levers for shifting said typewheel along its axis to an extent whichvaries according'to whether one or-the other of said levers is actuated, means for selectively actuating one of said levers to produce corresponding axial shifting of said typewheel, thereby bringing the corresponding row of type into printing position, and to return the typewheel into a position to leave the printed character visible, and means for printing from said typewheel when in printing position.

4. Printing telegraph receiver comprising a typewheel having the type thereon arranged in two, rows, means for rotating the typewheel selectively, means including two levers of difierent ratios and-operating connections from each of said levers for shifting said typewheel along its axis to an extent which varies according; to whether one or the other of said levers is actu- 1 atecl, means for selectively actuating one of said lever to produce corresponding axial shifting of said typewheel, thereby bringing the corresponding rowof type into printing position, and to return the typewheel to an extent sufiicient to leave the printed character Visible, a single cam for actuating both levers in an approximation to asimple harmonic motion, means efiective-for 5;. Page printing-c telegraphreceivercomprising.

a platen; a spline shaitpara-llel-to the axis of said platen; a carriagezmovable. along-said spline shaft a typewheel having its axis, substantially-at right. angles to the axis-10f said: platen: and; haying; thereon, a; plurality, of rows of; type and. mounted. foraxial; movement. in said carriage, abail ex-v tending parallel. to vsaidr platen; and pivotally. mounted .ior movement about. an axis: parallel; to; itself; a .nrstylever :pivoted om said .:carriage-. n. slidably engaging saidbailior: moving said type Wheel-axially, agcar. wheel mounted on said cal?- riage. so: as to be; freely-rotatable I about, said spline. shaft, a. sleeve movable; with said; carriage; and; keyedv to; said: spline shaft, 3., self alig-ning. :Qou-

pli-ng rconnect-ing'said gear. Whee1and;,.sa-id. sleeve,

gearingconnecting said; typewheel'andi said, gear: wheel, meansz'for; selectii/ely rotating; said spline:

shaft to selectively rotate said.typewheel, means lectively rendeningvone .of said; levers effective when acted upon-.2 by said 1. cam... to move said bail to, anzextent suflicientto move the typewheel t0 bring'the correspondingrow of type-intov printing;

position and" to: returnsthe typewheel. to; a posi:

b10112. in: which the; printed 1.character" is, visible, 1

means. efiectiveupon the. receipt of each. character to "causea comp ete: rotation of saidc m; means for printing from sa-idtypewheel when the selected row: of type-.isin printing position'and;

means for traversing; said carriage along said. splineshaft for letter. spacing.-

6-. Printing. telegraph: receiver 5 comprising. a;

typewheeh. means for: selectively rotating; said.

typewheeL, alever for moving saidtypewheei axe ially into: printing; position to print. one lineazoi;

type: and; out-oi such printing. Position to- .leave the printed character visible, agcam for, actuating said =leven1in "an approximationytoa simplejharmonic motion, w'shaft: upon. which said cam'is,

fixed-inxsuch, position that when the, shaft is sta tionarythe said type wheel is out of prin ing no.

sition, means. for-starting-the rotation of'said-q shaft. after the lapse of approximately half the interval; allotted; to acomplete rotation of the typewheeir after the commencement of such rotatiom. means for arresting said shaft in said first, mentioned position, and means for printing. from said typewheel; when. in printing position.

7. Printing telegraph receiver comprising, a typewheel having; the type thereon arranged ,in' two rows-,1 means:v for rotating the typewheel selectively, twolevershavingdifferent effects and corresponding to the respective rows for moving the typewheel axially until the desired rowis inprinting position: and returning; the typewheel to an extent su-fficien-t to leave the printed: characterv visible, acam; acam follower attached; to the lever: of lesser effect, means forholdingsaid; cam followerin actuable-relation to; said. cam,- spring means for drawin t the lever. of greater: effect into actuable relation to. saidcam follower,- means for selectively retaining; the lever of greater effect against actuation by saidspring;-

11 means, means effective for each character received to rotate said cam and means for printing from a row of type on said typewheel when said row is in printing position.

8. Page printing telegraph receiver comprising a rotatable platen, a spline shaft parallel to the axis of said platen, a carriage movable along said spline shaft, a typewheel mounted in said carriage with its axis substantially at right angles to the axis of said platen, a gear wheel mounted on said carriage so as to be freely rotatable about said spline shaft, a sleeve keyed to said spline shaft and movable with said carriage, a narrow member slidable on said spline shaft located between said gear wheel and said sleeve and havin slots in its opposite ends, the said slots being at right angles, key on said gear wheel and said sleeve respectively engaging in respective slots, gearing connecting said typewheel and said gear wheel, means for selectively rotating said spline shaft to select a type on said typewheel, means for actuating the selected type for printing and means for traversing said movable carriage along said spline shaft for letter spacing.

9. Printing telegraph receiver comprising a type wheel having the type thereon arranged in two rows, and means for selectively moving said type wheel axially from a print-exposing position to a printing position for a selected row and returning the same including a member connected to said type wheel to impart corresponding movement thereto, a cam follower parallel tosaid member, means including a rotatable cam for actuating said cam follower, a lever having an arm connected to said cam follower to move therewith and an arm engaging said member to move the upper row of type to the printing line, a second lever having its fulcrum closer to the cam follower than that of the first lever and with one arm engaging said member and the other arm engaging said cam follower at one side to be returned thereby, and spring means acting on the second lever to move the type wheel and place the lower row of type in printing position, the return movement of the cam follower returning the second lever to normal position against the action of said spring means.

10. Page printing telegraph receiver comprising a platen, a shaft adjacent said platen, a carriage movable along said shaft, a typewheel having thereon a plurality of rows of type and mounted for axial movement in said carriage, a bail extending parallel to said platen and pivotally mounted for movement about an axis parallel to itself, a first lever pivoted on said carriage and slidably engaging said bail for moving said typewheel axially, a gear wheel mounted on said carriage so as to be freely rotatable about said shaft, a sleeve movable with said carriage and keyed to said shaft, means connecting said gear wheel and said sleeve, means connecting said typewheel and said gear wheel, means for selectively rotating said shaft to selectively rotate said typewheel, means for selectively shifting said typewheel to bring a selected row of type into printing position including a lever corresponding to each of the rows of type and each lever acting differently upon said bail, a single cam for moving said levers in an. approximation to a simple harmonic motion during a complete rotation thereof, means for selectively rendering one of said levers effective when acted upon by said cam to move said bail to an extent sufficient to move the typewheel to bring the corresponding row of type into printing position and to return the typewheel to a position in which the Printed character is visible, means effective upon the receipt of each character to cause a complete rotation of said cam, means for printing from said typewheel when the selected row of type is in printing position and means for traversing said carriage along said shaft for letter spacing.

11. Page printing telegraph receiver comprising a platen, a spline shaft parallel to the axis of said platen, a carriage movable along said spline shaft, a typewheel having its axis substantially at right angles to the axis of said platen and having thereon a plurality of rows of type and mounted for axial movement in said carriage, a bail piovtally mounted for movement about an axis parallel to itself, means engaging said ball for moving said typewheel axially, a gear wheel mounted on said carriage so as to be freely rotatable about said spline shaft, a sleeve movable with said carriage and keyed to said spline shaft, a self-aligning coupling connecting said gear wheel and said sleeve, gearing connecting said typewheel and said gear wheel, means for selectively rotating said spline shaft to selectively rotate said typewheel, means for selectively shifting said type Wheel to bring a selected row'of type into printing position including a lever corresponding to each of the rows of type and each lever acting differently upon Said bail, a single cam for moving said levers in an approximation to a simple harmonic motion during a complete rotation thereof, means for selectively rendering one of said levers effective when acted upon by said cam to move said bail to an extent sufllcient to move 1 the typewheel to bring the corresponding row of type into printing position and to return the typewheel to a position in which the printed character is visible, means effective upon the receipt of each character to cause a complete rotation of said cam, means for printing from said typewheel when, the selected row of type is in printing position and means for traversing said carriage along said spline shaft for letter spacing.

12; Page printing telegraph receiver comprising a platen, a spline shaft adjacent said platen, a carriage movable along said shaft, a typewheel having thereon a plurality of rows of type and mounted for axial movement in said carriage,'a

rpbail pivotally mounted for movement about an .carriage and keyed tosaid shaft, means connecting said gear wheel and said sleeve, means connecting said typewheel and said gear wheel, means for selectively rotating said shaft to selectively rotate said typewheel, means for selectively shifting said typewheel to bring a selected row of type into printing position including a lever corresponding to each of the rows of type and each lever' acting differently upon said bail, a single cam for moving said levers in an approximation to a simple harmonic motion during a complete rotation thereof, means for selectively rendering one of said levers effective when acted upon by said cam to move said bail to an extent sufficient to move the typewheel to bring th responding row of type into printing position and I to return the typewheel to a position in which the printed character is visible, means effective upon the receipt of each character to cause a complete rotation of said cam, means for printing from said typewheel when the selected row of type is type and out of such printing position to leave the printed character visible, means for actuating said lever in an approximation to a simple harmonic motion, a shaft upon which said actuating means is fixed in such position that when the shaft is stationary the said typewheel is out of printing position, means for starting the rotation of said shaft after the lapse of approximate- 1y half the interval allotted to a complete rotation'of the typewheel after the commencement of such rotation, means for arresting said shaft in said first mentioned position, and means for printing from said typewheel when in printing position.

14. Printing telegraph receiver comprising a typewheel having the type thereon arranged in two rows, means for rotating the typewheel selectively, means including a cam and two levers having different effects and corresponding to the respective rows for moving the typewheel different distances so that one or the other row is in printing position, depending upon which lever is actuated, means for selectively determining which of said two levers is to be actuated on each rota- 3o tion'of said cam, means effective for each character received to rotate said cam, and means for printing from a row of type on said typewheel when said row is in printing position.

15. Page printing telegraph receiver compris- 35 ing a rotatable platen, a spline shaft parallel to the axis of said platen, a arriage movable along said spline shaft, a typewheel mounted in said carriage with its axis substantially at right angles to the axis of said platen, a gear wheel mounted on said carriage so as to be freely rotatable about said spline shaft, a sleeve keyed to said pline shaft and movable with said carriage, a coupling member on said spline shaft between said gear wheel and said sleeve, means on said gear wheel and said sleeve respectively engaging said coupling member, means connecting said typewheel and said gear wheel, means for selectively rotating said spline shaft to select a type on said typewheel, means for actuating the selected type for printing and means for traversing said m'ovable carriage along said spline shaft for letter spacing.

REGINALD DENNIS SALMON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Levin July 4, 1944 

